Re: [Scilab-users] Function "locate" for 3d graphs

[Samuel Gougeon]

Hello Izabela,

locate() is being fixed against 3 bugs in 2D @ 
https://codereview.scilab.org/#/c/20018/
But beyond this, you are right, it could deserve to be upgraded in order 
to become

usable in 3D.
Please do not hesitate to post a report for this wish, on bugzilla.

The interactive java curve editor is already able to edit 3D curves:
param3d() + right-click on the curve and edit its points.

But locate() and xchange() presently work only in 2D.

Regards
Samuel

Le 14/06/2018 à 13:28, Izabela Wójcik-Grząba a écrit :

Hello,

I've got another question. Is there a function like "locate" but 
appropriate for param3d plot. I would like to pick some points from my 
param3d plot.


Regards,
Iza
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Re: [Scilab-users] {EXT} Re: Function "locate" for 3d graphs

[Izabela Wójcik-Grząba]

Yes, I thought about the situation when the points are part of the 
graph. As there is no such function in Scilab I will have to manage with 
it in a different way. Thanks all.


Iza




W dniu 15.06.2018 10:48, Stéphane Mottelet napisał(a):

Of course, if points are part of a graph it is doable. But a « locate
» giving raw 3D coordinates has no sense...

S.

Le 15 juin 2018 à 09:24, Dang Ngoc Chan, Christophe 
 a écrit :


Hello,

De : users [mailto:users-boun...@lists.scilab.org] De la part de 
Stéphane Mottelet

Envoyé : vendredi 15 juin 2018 08:49

Your 3D graphics is projected on 2D. How could you get points in 3D ?


This is a common feature of the CAD softwares and I think I already 
saw this on some data analysis software.
Youv'e got an injective function between the projected points on the 
screen and the 3D data points.


However, I don't claim it is easy to implement.
I guess you can do this manually with the matrix used for the 2D 
projection

which you can compute from the view angles.

Regards

--
Christophe Dang Ngoc Chan
Mechanical calculation engineer
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[Scilab-users] hist3d() puzzling rendering

[Samuel Gougeon]

Hello,

Using hist3d() -- just enter hist3d() to plot the example --, and 
rotating the figure in 3D (right-press and drag), we can note that the 
color of the different faces are not the same: 2 of the four faces are 
rendered with the hidden color (usually used for the internal or back 
faces), and the 2 other ones with the default or chosen color and color 
mode.


I was deeming that the usage of the hidden color for 2 over 4 apparent 
faces is a bug .


Now, i am wondering if it is not rather intentional, in order to have a 
kind of lighting effect.


I still think that, even if it was intentional, it should rather be 
fixed. Now, Scilab has some explicit lighting features.


But, before possibly processing the bug report, what's your opinion?

Samuel

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Re: [Scilab-users] {EXT} Re: Function "locate" for 3d graphs

[Stéphane Mottelet]

Of course, if points are part of a graph it is doable. But a « locate » giving 
raw 3D coordinates has no sense...

S.

> Le 15 juin 2018 à 09:24, Dang Ngoc Chan, Christophe 
>  a écrit :
> 
> Hello,
> 
>> De : users [mailto:users-boun...@lists.scilab.org] De la part de Stéphane 
>> Mottelet
>> Envoyé : vendredi 15 juin 2018 08:49
>> 
>> Your 3D graphics is projected on 2D. How could you get points in 3D ?
> 
> This is a common feature of the CAD softwares and I think I already saw this 
> on some data analysis software.
> Youv'e got an injective function between the projected points on the screen 
> and the 3D data points.
> 
> However, I don't claim it is easy to implement.
> I guess you can do this manually with the matrix used for the 2D projection
> which you can compute from the view angles.
> 
> Regards
> 
> --
> Christophe Dang Ngoc Chan
> Mechanical calculation engineer
> This e-mail may contain confidential and/or privileged information. If you 
> are not the intended recipient (or have received this e-mail in error), 
> please notify the sender immediately and destroy this e-mail. Any 
> unauthorized copying, disclosure or distribution of the material in this 
> e-mail is strictly forbidden.
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Re: [Scilab-users] {EXT} Re: Function "locate" for 3d graphs

[Dang Ngoc Chan, Christophe]

Hello,

> De : users [mailto:users-boun...@lists.scilab.org] De la part de Stéphane 
> Mottelet
> Envoyé : vendredi 15 juin 2018 08:49
>
> Your 3D graphics is projected on 2D. How could you get points in 3D ?

This is a common feature of the CAD softwares and I think I already saw this on 
some data analysis software.
Youv'e got an injective function between the projected points on the screen and 
the 3D data points.

However, I don't claim it is easy to implement.
I guess you can do this manually with the matrix used for the 2D projection
which you can compute from the view angles.

Regards

--
Christophe Dang Ngoc Chan
Mechanical calculation engineer
This e-mail may contain confidential and/or privileged information. If you are 
not the intended recipient (or have received this e-mail in error), please 
notify the sender immediately and destroy this e-mail. Any unauthorized 
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forbidden.
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Re: [Scilab-users] Function "locate" for 3d graphs

[Stéphane Mottelet]

Hello,

Your 3D graphics is projected on 2D. How could you get points in 3D ?

S.

> Le 15 juin 2018 à 04:12, André FS  a écrit :
> 
> Hi Iza,
> 
> What if you use the linear_interpn [1]?
> 
> [1] https://help.scilab.org/doc/5.3.3/en_US/linear_interpn.html
> 
> Regards,
> 
> André
> 
>> Em qui, 14 de jun de 2018 às 08:30, Izabela Wójcik-Grząba 
>>  escreveu:
>> Hello,
>> 
>> I've got another question. Is there a function like "locate" but 
>> appropriate for param3d plot. I would like to pick some points from my 
>> param3d plot.
>> 
>> Regards,
>> Iza
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